[Schlesinj]

I will summarize what I understand and feel free to add:
There was a significant discussion about these cards several years after a group (not the ones listed above) of cards were listed on eBay. Several people discussed the merits of those cards and Roland through someone else was was consulted (before he became a member here). He, at the time, I believe physically held those cards and feels comfortable they are a real and extremely scarce issue. He provided some history of the information/stats on the back.

He did write about them in one of his books (which I own).

I think you can find some of the history of the cards in a separate thread via the search and also some more recent comments when the Hake’s auction occurred in this thread.